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September Weather in Weslaco, United States

Last updated: June 24, 2025

In Weslaco, United States, the average temperature in September is a warm 29°C (84°F). Expect a range from a refreshing minimum of 17°C (64°F) to a sizzling maximum of 39°C (103°F). During this month, you'll encounter about 101 mm (4.0 in) of precipitation spread over 13 days, accompanied by an average humidity of 73%.

September Temperature in Weslaco

In September in Weslaco, the average temperature is 29°C (84°F). Maximum temperatures can reach 39°C (103°F), while minimums can drop to as low as 17°C (64°F). Be prepared for warm weather, and pack layers for cooler evenings when traveling to Weslaco this month.

September Weather in Weslaco: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Weslaco, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Weslaco, September typically has an average temperature of 29°C (84°F), with highs reaching up to 39°C (103°F) and lows dropping to around 17°C (64°F).
JanFebMarAprMayJunJulAugSepOctNovDec626572778285868783776964
Data source: Temperature data for Weslaco generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Weslaco

In Weslaco in September, the precipitation amount is 101 mm (4.0 in) over the course of 13 days.

September Precipitation Trends in Weslaco

The chart displays monthly precipitation patterns in Weslaco, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Weslaco, September typically receives around 101 mm (4.0 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec2322323086879728101583022
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Weslaco

In Weslaco in September, humidity is 73%. With an average temperature of 29°C (84°F), this humidity feels like a warm blanket wrapped around you, making travel slightly uncomfortable as you sweat and seek shade, yet still inviting you to explore the vibrant local culture and activities.

September Average Humidity in Weslaco

This chart illustrates the average monthly humidity levels in Weslaco, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Weslaco is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%79%76%77%80%73%66%65%73%76%80%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Weslaco

In Weslaco in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Weslaco.

Maximum UV Index Levels in Weslaco for September

The chart shows the monthly maximum UV Index (UVI) for Weslaco in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Weslaco typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec6910111212121211976
Data source: Weslaco September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Weslaco Compares to Other Months

Weather in Weslaco varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Weslaco, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Weslaco, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather17°C (62°F)22 mm (0.9 inches)83%high
February Weather18°C (65°F)22 mm (0.9 inches)79%very high
March Weather22°C (72°F)32 mm (1.2 inches)76%very high
April Weather25°C (77°F)30 mm (1.2 inches)77%extreme
May Weather28°C (82°F)86 mm (3.4 inches)80%extreme
June Weather29°C (85°F)87 mm (3.4 inches)73%extreme
July Weather30°C (86°F)97 mm (3.8 inches)66%extreme
August Weather31°C (88°F)28 mm (1.1 inches)65%extreme
September Weather29°C (84°F)101 mm (4.0 inches)73%extreme
October Weather25°C (77°F)58 mm (2.3 inches)76%very high
November Weather21°C (69°F)30 mm (1.2 inches)80%high
December Weather18°C (65°F)22 mm (0.8 inches)86%high

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